| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner binder excellent in achieving both of low-temperature fixability and hot offset resistance (a fixing temperature width) and excellent in storage stability.SOLUTION: The toner binder comprises a polyester resin (A), a specified crystalline resin (B) and if necessary, a noncrystalline linear polyester resin (C). The polyester resin (A) includes a carboxylic acid component (x) and a polyol component (y) as structural units, in which the component (x) contains a dicarboxylic acid (x1) selected from an aromatic dicarboxylic acid and ester-forming derivatives thereof, by 80 mol% or more, and also contains a polycarboxylic acid (x2) having a valence of 3 or more, and the component (y) contains 1,2-propylene glycol (y1) by 70 mol% or more; and the polyester resin (A) has a storage modulus [G'(150)] of 1500 Pa or more at 150°C, with the [G'(150)] and a storage modulus [G'(180)] at 180°C satisfying a specified formula. |
